Air play mirroring mac with mountain lion, sound is working but video is extremely slow to update

I am trying to get air play mirroring working on my  mid 2011 Mac book pro and Apple TV 3 (latest one) with mountain lion. I have the icon, it seems to connect to each other, and the screen shows up on my apple TV, yet it doesnt update, takes a long time to show up at all, just keeps showing the same screen. However, the audio works fine, I tried to play a Xfinity stream through safari, the video didnt show up on apple TV but the sound came through with no delay. Any ideas?

thanks for the help.... even thought it didn't work...
basically I think i either have some virus or this is the result of that stupid update I did... I know i did that keyboard one an itunes one a quicktime one and there might've been another.

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